Monday, September 9, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOL, FAIR WEATHER DAY WITH CONDITIONS
BECOMING MOSTLY CLOUDY IN THE AFTERNOON….

Visibility has stayed at a nice 80 miles for the
duration of the day today. Dew points have remained
comfortable in the low to mid-50s. Winds have been
on the lighter side at around 8 MPH and direction
has been generally NE. Observed increasing cloud
cover since this morning with mostly cloudy skies
being seen in the afternoon. Cooler than normal temperatures
today are due to increasing clouds and a light sea breeze.
The high so far today is 71F, 3 degrees below the daily
normal maximum of 74F. The low so far today is 54F, 3 degrees
below the daily normal minimum of 57F.

PRELIMINARY STATS FOR AUGUST 2019

TEMPERATURE, Deg. F
Avg. Max. 80.4 [+1.2] Avg. Min. 62.1 [+0.3] Mean      71.5 [+1.0] 24-hour corrected mean: 70.5
Max. for month: 92F on the 19th
Min. for month: 51F on the 26th

COOLING DEGREE DAYS
Total cooling units:   211 [+22] Total for the season:  619 [+82] Total for last season: 753

PRECIPITATION, Inches
Total: 1.83 [-2.21] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus
Temperature: 59F; Dew Point: 50F; Wind: NNE at 7 kts
Sea-level pressure: 30.27 ins. Hg, rising, then more slowly
Visibility: 75 miles
6-hr Max temp: 59F
6-hr Min temp: 54F
24-hr Precip: 0.00 ins.
BHO SA 1155 60 SCT 75 251/59/50/0207/027/ 8/400 51018
10059 20054

10 A.M.
Weather: Scattered stratocumulus, scattered cirrocumulus
Temperature: 67F; Dew Point: 52F; Wind: NNE at 7 kts
Sea-level pressure: 30.31 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 in.
BHO SA 1455 50 SCT 250 80 265/67/52/0307/031/ 8/809 51014

1 P.M.
Weather: Broken stratocumulus, broken altocumulus
Temperature: 68F; Dew Point: 52F; Wind: ENE at 7 kts
Sea-level pressure: 30.29 ins. Hg, falling unsteadily
Visibility: 80 miles
6-hr Max temp: 71F
6-hr Min temp: 59F
BHO SA 1755 E60 BKN 180 BKN 80 257/68/52/0607/029/ 8/850 57008
10071 20059

SUMMARY FOR SUNDAY, SEPTEMBER 8, 2019

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..74
MIN…..53   NORMAL…..57
MEAN….63   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………-18 [-2.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE MONTH…………..12   DEPARTURE……..-15
TOTAL COOLING UNITS FOR THE SEASON…………631   DEPARTURE……..+67
TOTAL COOLING UNITS LAST SEASON TO DATE…….822   DEPARTURE…….-191

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 W   AT  2:43 A.M.
AERO…………………….21 W   AT  5:21 A.M.
ASOS…………………….23 W   AT  2:46 A.M.
DAVIS……………………26 WNW AT  2:45 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….18 W   AT  5:20 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 W   AT  3:02 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 W   AT  3:02 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.3 WNW
ASOS……………………9.7
DAVIS………………….10.8 WNW [291 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.67  DEPARTURE……-0.29
ASOS…………..0.67
TOTAL PRECIPITATION FOR THE YEAR……….37.82  DEPARTURE……+1.83
ASOS………….37.70

PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

8/01  84/66/75/+3/0.00/755/87               18 NNW AERO 20 NW  RMY 17
8/02  83/61/72/0/0.00/804/93                18 WSW AERO 18 WSW RMY 18
8/03  84/66/75/+3/0.00/302/35               25 SW  AERO 26 SW  RMY 25
8/04  83/66/75/+3/0.00/732/85               21 NE  AERO 23 SW  RMY 25
8/05  81/58/70/-2/0.00/842/98               20 S   AERO 18 S   RMY 19
8/06  79/63/71/-1/0.00/282/33               15 S   AERO 14 S   RMY 17
8/07  82/66/74/+2/0.34/367/43               32 SSW AERO 35 SSW RMY 35
8/08  84/67/76/+4/0.44/588/69               30 SW  AERO 24 WNW RMY 29
8/09  82/63/73/+1/0.00/815/96               28 NW  AERO 25 NW  RMY 26
8/10  78/59/69/-2/0.00/720/85               32 NW  AERO 28 NW  RMY 28
8/11  78/55/67/-4/0.00/734/87               28 W   AERO 25 W   RMY 28
8/12  82/60/71/0/0.00/749/89                25 W   AERO 23 W   RMY 26
8/13  77/66/72/+1/0.02/059/07               25 W   AERO 24 WSW RMY 24
8/14  75/62/69/-2/T/452/54                  24 ENE AERO 22 ENE RMY 22
8/15  77/59/68/-3/0.02/568/68               17 ESE AERO 15 SSE RMY 16
8/16  78/61/70/-1/0.00/740/89               20 E   AERO 17 ESE RMY 18
8/17  78/67/73/+2/0.01/099/12               14 SE  AERO 15 SE  RMY 15
8/18  88/70/79/+8/0.00/529/64               18 SSW AERO 18 SSW RMY 21
8/19  92/69/81/+11/0.03/536/65              25 WSW AERO 23 WSW RMY 25
8/20  87/66/77/+7/0.00/797/97               18 W   AERO 14 WSW RMY N/A
8/21  85/68/77/+7/0.12/287/35               33 SW  AERO 32 SW  RMY 33
8/22  88/68/78/+8/0.00/522/64               25 W   AERO 21 W   RMY 26
8/23  78/60/69/-1/0.04/016/02               23 N   AERO 18 N   RMY 24
8/24  72/55/64/-6/0.00/803/99               25 ENE AERO 21 ENE RMY 22
8/25  66/56/61/-8/0.00/590/73               31 ENE AERO 25 ENE RMY 29
8/26  71/51/61/-8/0.00/717/89               25 NE  AERO 21 NE  RMY 25
8/27  77/54/66/-3/0.00/530/66               18 SSW AERO 18 SSW RMY 17
8/28  78/59/69/0/0.66/184/23                21 SSE AERO 18 SSE RMY 20
8/29  83/63/73/+4/0.15/614/77               25 WNW AERO 21 WNW RMY 26
8/30  84/59/72/+4/0.00/739/93               30 SW  AERO 30 SW  RMY 28
8/31  79/61/70/+2/0.00/602/76               21 W   AERO 18 W   RMY 20

PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

9/01  73/56/65/-3/0.00/…/..                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/…/..                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/…/..                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/…/..                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/…/..                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/…./…/..                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.00/…/..                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/…/..                25 W   AERO 21 W   RMY N/A

9/09 Low temp since midnight is 54F; normal low is 57F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978

RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972

TODAY’S REPORT PREPARED BY: Benjamin Turner and Andrew Swanson